KIRKUK, IRAQ - MARCH 14 : In this undated photo made on March 14, 2015, by the Kurdish Region Security Council (KRSC), Peshmerga forces walk around the site of a bomb attack on a road between Mosul, Iraq in northern Iraq. Kurdish authorities in Iraq said they have evidence that Daesh (Islamic State of Iraq and the Levant) used chlorine gas as a chemical weapon against peshmerga fighters. (Photo by Pool - Kurdish Region Security Council/Anadolu Agency/Getty Images)